66321303525 has 42 divisors (see below), whose sum is σ = 123301253490. Its totient is φ = 35371352160.

The previous prime is 66321303493. The next prime is 66321303541. The reversal of 66321303525 is 52530312366.

66321303525 is a `hidden beast` number, since 6 + 6 + 321 + 303 + 5 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 12266448516 + 54054855009 = 110754^2 + 232497^2 .

It is not a de Polignac number, because 66321303525 - 2⁵ = 66321303493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66321303525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 1801290 + ... + 1837739.

Almost surely, 2^66321303525 is an apocalyptic number.

It is an amenable number.

66321303525 is a deficient number, since it is larger than the sum of its proper divisors (56979949965).

66321303525 is an equidigital number, since it uses as much as digits as its factorization.

66321303525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639057 (or 3639037 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The spelling of 66321303525 in words is "sixty-six billion, three hundred twenty-one million, three hundred three thousand, five hundred twenty-five".